Left.4 DOOR. Lock cylinder screw. Right.4 DOOR. A Screw that is used to secure the Engine Coolant Expansion Tank to its mounting point. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Door Lock Cylinder to it's mounting point. Bolt that secures the exterior Door handle. Engine Coolant Reservoir Bolt. Engine Coolant Recovery Tank. Exterior Door Handle. Handle, outside. Level indicator. Lock Cylinder.